>.CurrentControl = 'Text1' problem is ok but i have tried to open sgridtextbox (i didn't release it normally class browser must give error but giving no error) how can i understand is class in memory ?

If the Grid is instantiated, and any Column has an instance of sgridtextbox in it, then the class is in memory. In order to edit it in the Class Browser, you'll need to release the controls based on that class.