RE: Bitmap displayed in ToolBox of Visual Studio for a control

Hi Charles,

I performed a test based on your description and did see the same thing as
you did.

I create a Winforms application project and add a component to the project.
I add a ToolboxBitmapAttribute to the component. The following is the code
of the component.

[ToolboxBitmap(typeof(Button))]
public partial class class1:Component
{
...
}

After I build the project, a tab with the same name as the project is
populated automatically in the Toolbox and the component appears under this
tab. The bitmap next to the component is the default bitmap.

I also performed a test adding the component to the Toolbox manually, and
see the bitmap next to the component is correct at this time. It means that
the bitmap specified by the ToolboxBitmapAttribute isn't shown in
auto-generated items.

FYI, to do this, right-click on the Toolbox and select 'Choose Items'. In
the 'Choose Toolbox Items' dialog, switch to the '.NET Framework
Components' tab page and click the 'Browse' button to specify the assembly
containing the component. After I select the assembly, the component name
appears in the list box and I select the checkbox before the component.
Press OK button to close the dialog. The new added component has a correct
bitmap.

I have searched in our inner database. I find that this behavior is by
design for performance reasons. The relevant documentation should have
pointed it out. A good news is that our product team has considered this as
they prepare the next release of the documentation.

We are sorry for the inconvenience the documentation brings to you!

Hope this helps.
If you have anything unclear, please feel free to let me know.


Sincerely,
Linda Liu
Microsoft Online Community Support

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