UICONTEXT_Debugging is not working

Hi All,

We are extending Visual Studio's functionality. In this, we have used Visual Studio's solution Explorer with few menus like File, Edit, View, Project, Build & Debug. Under "Debug" Menu, We have following sub menus like Windows(VS standard Sub Menu), Start Debugging (VS standard Sub Menu), Settings(Custom Menu), Attach To Project(Custom Menu), Stop Debugging(Custom Menu) etc ...

I have created Sub menu under "Debug" main menu as  - 

<Button guid="guidVSPackage1CmdSet" id="cmdidDebuggerStopDebugging" priority="0x0900" type="Button">
        <Parent guid="guidVSPackage1CmdSet" id="XPI_G_MM_Debug_Footer"/>
        <CommandFlag>DynamicVisibility</CommandFlag>
        <CommandFlag>DefaultDisabled</CommandFlag>
        <CommandFlag>DefaultInvisible</CommandFlag>
        <CommandFlag></CommandFlag>
        <Strings>
          <CommandName>Stop Debugging</CommandName>
          <ButtonText>Stop Debugging</ButtonText>
        </Strings>
      </Button>

I want "Stop Debugging" sub menu to be enable only when I have clicked on "Start Debugging" sub menu of Visual Studio.

I have used VisibilityConstraints in my.Vsct file as 

<VisibilityItem guid="guidVSPackage1CmdSet" id="cmdidDebuggerStopDebugging" context="UICONTEXT_Debugging"/>

But problem is that, "Stop Debugging" sub menu is visible when my package is loaded and debugging is not activated (Means UICONTEXT_Debugging is not working in my case).

Instead, I want "Stop Debugging" should be enable it when Debugging is activated and hide it when Debugging is

dis activated.

Please suggest me solution.

Thanks,

Sudarshan