in visual studio, go in view -> to 'explore library' (dont know the exact english terms) then you can explore your plugin API : functions and properties.
VLC & web IT consulting - http://www.revolunet.com
Github : http://github.com/revolunet
It is possible to change the cone with the an other bmp file that you want.
you have to use a "Resource tunner applicatin" and edit the activex file and change the cone.
If you want to show nothing you have to make a white bmp file and then follow instructions.