Activate Visio Control

Hi

I'm using Visio Active X control in Visual Studio .Net in C#....

i have user defined Stencil and a button to load and close the stencil in
the application....

For the first time when the application is opened it open's the stencil
window for the the application ...but when i opened the same page for the
same application the stencil window doesn't open even if I clicked on the
Button.....


Any Solutions/Ideas will help me out

thanks

dinesh