diff --git a/libs/remix-debug/src/solidity-decoder/internalCallTree.ts b/libs/remix-debug/src/solidity-decoder/internalCallTree.ts
index 4233ec9cbb..4f74ad4585 100644
--- a/libs/remix-debug/src/solidity-decoder/internalCallTree.ts
+++ b/libs/remix-debug/src/solidity-decoder/internalCallTree.ts
@@ -165,7 +165,6 @@ export class InternalCallTree {
     const scope = this.findScope(vmtraceIndex)
     if (!scope) return []
     let scopeId = this.scopeStarts[scope.firstStep]
-    const scopeDetail = this.scopes[scopeId]
     const functions = []
     if (!scopeId) return functions
     let i = 0
@@ -174,6 +173,7 @@ export class InternalCallTree {
       i += 1
       if (i > 1000) throw new Error('retrieFunctionStack: recursion too deep')
       const functionDefinition = this.functionDefinitionsByScope[scopeId]
+      const scopeDetail = this.scopes[scopeId]
       if (functionDefinition !== undefined) {
         functions.push({ ...functionDefinition, ...scopeDetail })
       }
@@ -280,7 +280,10 @@ async function buildTree (tree, step, scopeId, isCreation, functionDefinition?,
     const stepDetail: StepDetail = tree.traceManager.trace[step]
     const nextStepDetail: StepDetail = tree.traceManager.trace[step + 1]
     if (stepDetail && nextStepDetail) {
+      // for complicated opcodes which don't have a static gas cost:
       stepDetail.gasCost = parseInt(stepDetail.gas as string) - parseInt(nextStepDetail.gas as string)
+    } else {
+      stepDetail.gasCost = parseInt(stepDetail.gasCost as unknown as string)
     }
         
     // gas per line
diff --git a/libs/remix-debug/test/decoder/localsTests/int.ts b/libs/remix-debug/test/decoder/localsTests/int.ts
index 53f0e11978..fa52b55714 100644
--- a/libs/remix-debug/test/decoder/localsTests/int.ts
+++ b/libs/remix-debug/test/decoder/localsTests/int.ts
@@ -61,6 +61,11 @@ module.exports = function (st, privateKey, contractBytecode, compilationResult,
               st.equals(functions3.length, 1)
   
               st.equal(functions1[0].gasCost, 54)
+              st.equal(functions1[1].gasCost, 436)
+
+              st.equal(functions2[0].gasCost, 23)
+              st.equal(functions2[1].gasCost, 54)
+              st.equal(functions2[2].gasCost, 436)
     
               st.equals(Object.keys(functions1[0])[0], 'functionDefinition')
               st.equals(Object.keys(functions1[0])[1], 'inputs')
diff --git a/libs/remix-ui/debugger-ui/src/lib/debugger-ui.css b/libs/remix-ui/debugger-ui/src/lib/debugger-ui.css
index 1a5e4926a9..01754f6ca3 100644
--- a/libs/remix-ui/debugger-ui/src/lib/debugger-ui.css
+++ b/libs/remix-ui/debugger-ui/src/lib/debugger-ui.css
@@ -20,4 +20,7 @@
 .debuggerPanels {
   overflow-y: auto;
   height: fit-content;
+}
+.jumpToFunctionClick span {
+  cursor: pointer;
 }
\ No newline at end of file
diff --git a/libs/remix-ui/debugger-ui/src/lib/debugger-ui.tsx b/libs/remix-ui/debugger-ui/src/lib/debugger-ui.tsx
index 73333e01a5..6ea35adb1c 100644
--- a/libs/remix-ui/debugger-ui/src/lib/debugger-ui.tsx
+++ b/libs/remix-ui/debugger-ui/src/lib/debugger-ui.tsx
@@ -461,7 +461,7 @@ export const DebuggerUI = (props: DebuggerUIProps) => {
         {state.debugging && <StepManager stepManager={stepManager} />}
       </div>
       <div className="debuggerPanels" ref={panelsRef}>
-        {state.debugging && <VmDebuggerHead debugging={state.debugging} vmDebugger={vmDebugger} />}
+        {state.debugging && <VmDebuggerHead debugging={state.debugging} vmDebugger={vmDebugger} stepManager={stepManager} />}
         {state.debugging && (
           <VmDebugger
             debugging={state.debugging}
diff --git a/libs/remix-ui/debugger-ui/src/lib/vm-debugger/dropdown-panel.tsx b/libs/remix-ui/debugger-ui/src/lib/vm-debugger/dropdown-panel.tsx
index 5c68417418..55174aee9b 100644
--- a/libs/remix-ui/debugger-ui/src/lib/vm-debugger/dropdown-panel.tsx
+++ b/libs/remix-ui/debugger-ui/src/lib/vm-debugger/dropdown-panel.tsx
@@ -20,6 +20,8 @@ export const DropdownPanel = (props: DropdownPanelProps) => {
     extractFunc,
     formatSelfFunc,
     registerEvent,
+    handleExpandFunc,
+    formatClassNamesFunc,
     triggerEvent,
     loadMoreEvent,
     loadMoreCompletedEvent,
@@ -135,9 +137,9 @@ export const DropdownPanel = (props: DropdownPanelProps) => {
         toggleDropdown: !prevState.toggleDropdown
       }
     })
-  }
+  };
 
-  const handleExpand = (keyPath) => {
+  const handleExpand = handleExpandFunc || function (keyPath) {
     if (!state.expandPath.includes(keyPath)) {
       state.expandPath.push(keyPath)
     } else {
@@ -221,6 +223,7 @@ export const DropdownPanel = (props: DropdownPanelProps) => {
           label={formatSelfFunc ? formatSelfFunc(key, data) : formatSelfDefault(key, data)}
           onClick={() => handleExpand(keyPath)}
           expand={state.expandPath.includes(keyPath)}
+          labelClass={formatClassNamesFunc && formatClassNamesFunc(key, data)}
         >
           <TreeView id={`treeView${key}`} key={keyPath}>
             {children}
@@ -246,6 +249,7 @@ export const DropdownPanel = (props: DropdownPanelProps) => {
           label={formatSelfFunc ? formatSelfFunc(key, data) : formatSelfDefault(key, data)}
           onClick={() => handleExpand(keyPath)}
           expand={state.expandPath.includes(keyPath)}
+          labelClass={formatClassNamesFunc && formatClassNamesFunc(key, data)}
         />
       )
     }
diff --git a/libs/remix-ui/debugger-ui/src/lib/vm-debugger/function-panel.tsx b/libs/remix-ui/debugger-ui/src/lib/vm-debugger/function-panel.tsx
index 6450536f5a..d2106977ed 100644
--- a/libs/remix-ui/debugger-ui/src/lib/vm-debugger/function-panel.tsx
+++ b/libs/remix-ui/debugger-ui/src/lib/vm-debugger/function-panel.tsx
@@ -2,16 +2,31 @@ import React, {useState, useEffect} from 'react' // eslint-disable-line
 import DropdownPanel from './dropdown-panel' // eslint-disable-line
 import {default as deepequal} from 'deep-equal' // eslint-disable-line
 
-export const FunctionPanel = ({data, className}) => {
-  const [calldata, setCalldata] = useState(null)
+export const FunctionPanel = ({data, className, stepManager}) => {
+  const [functionData, setFunctionData] = useState(null)
 
   useEffect(() => {
-    if (!deepequal(calldata, data)) setCalldata(data)
+    if (!deepequal(functionData, data)) {
+      setFunctionData(data.map(el => el.label))
+    }
   }, [data])
 
+  const formatSelfFunc = (key, data) => {
+    return data.self
+  }
+
+  const handleExpandFunc = (keyPath) => {
+    stepManager.jumpTo(data[parseInt(keyPath)].function.firstStep)
+  }
+
+  const formatClassNamesFunc = (keyPath, data) => {
+    return 'jumpToFunctionClick'
+  }
+
   return (
+    
     <div id="FunctionPanel" className={className} data-id="functionPanel">
-      <DropdownPanel dropdownName="Function Stack" calldata={calldata || {}} />
+      <DropdownPanel dropdownName="Function Stack" calldata={functionData || {}} formatSelfFunc={formatSelfFunc} formatClassNamesFunc={formatClassNamesFunc} handleExpandFunc={handleExpandFunc} />
     </div>
   )
 }
diff --git a/libs/remix-ui/debugger-ui/src/lib/vm-debugger/vm-debugger-head.tsx b/libs/remix-ui/debugger-ui/src/lib/vm-debugger/vm-debugger-head.tsx
index 67ae5677fe..035d5f619a 100644
--- a/libs/remix-ui/debugger-ui/src/lib/vm-debugger/vm-debugger-head.tsx
+++ b/libs/remix-ui/debugger-ui/src/lib/vm-debugger/vm-debugger-head.tsx
@@ -5,7 +5,7 @@ import StepDetail from './step-detail' // eslint-disable-line
 import SolidityState from './solidity-state' // eslint-disable-line
 import SolidityLocals from './solidity-locals' // eslint-disable-line
 
-export const VmDebuggerHead = ({vmDebugger: {registerEvent, triggerEvent}, debugging}) => {
+export const VmDebuggerHead = ({vmDebugger: {registerEvent, triggerEvent}, debugging, stepManager}) => {
   const [functionPanel, setFunctionPanel] = useState(null)
   const [stepDetail, setStepDetail] = useState({
     'vm trace step': '-',
@@ -32,7 +32,11 @@ export const VmDebuggerHead = ({vmDebugger: {registerEvent, triggerEvent}, debug
         const functions = []
 
         for (const func of stack) {
-          functions.push((func.functionDefinition.name || func.functionDefinition.kind) + '(' + func.inputs.join(', ') + ')' + ' - ' + func.gasCost + ' gas')
+          const label = (func.functionDefinition.name || func.functionDefinition.kind) + '(' + func.inputs.join(', ') + ')' + ' - ' + func.gasCost + ' gas'
+          functions.push({
+            label,
+            function: func
+          })
         }
         setFunctionPanel(() => functions)
       })
@@ -127,7 +131,7 @@ export const VmDebuggerHead = ({vmDebugger: {registerEvent, triggerEvent}, debug
   return (
     <div id="vmheadView" className="mt-1 px-2 d-flex">
       <div className="d-flex flex-column pr-2" style={{flex: 1}}>
-        <FunctionPanel className="pb-1" data={functionPanel} />
+        <FunctionPanel className="pb-1" data={functionPanel} stepManager={stepManager} />
         <SolidityLocals className="pb-1" data={solidityLocals.calldata} message={solidityLocals.message} registerEvent={registerEvent} triggerEvent={triggerEvent} />
         <CodeListView className="pb-2 flex-grow-1" registerEvent={registerEvent} />
       </div>
diff --git a/libs/remix-ui/debugger-ui/src/types/index.ts b/libs/remix-ui/debugger-ui/src/types/index.ts
index a319e354be..a5893905e7 100644
--- a/libs/remix-ui/debugger-ui/src/types/index.ts
+++ b/libs/remix-ui/debugger-ui/src/types/index.ts
@@ -18,6 +18,8 @@ export type ExtractFunc = (json: any, parent?: any) => ExtractData
 export type FormatSelfFunc = (key: string | number, data: ExtractData) => JSX.Element
 export type RegisterEventType = (type: string, listener: any) => void // listener is a function
 export type TriggerEventType = (type: string, payload: Array<any>) => void
+export type HandleExpandFunc = (keyPath: string) => void
+export type FormatClassNamesFunc = (key: string | number, data: ExtractData) => string
 export interface DropdownPanelProps {
     dropdownName: string,
     className?: string,
@@ -30,6 +32,8 @@ export interface DropdownPanelProps {
     extractFunc?: ExtractFunc,
     formatSelfFunc?: FormatSelfFunc,
     registerEvent?: RegisterEventType,
+    handleExpandFunc?: HandleExpandFunc,
+    formatClassNamesFunc?: FormatClassNamesFunc
     triggerEvent?: TriggerEventType,
     loadMoreEvent?: string,
     loadMoreCompletedEvent?: string,