Help Me In Form6i Please

Hello All
I want to make a Form project which will open a MDI form without any
window ...when i will call different datablock from my custom menu then Specific window will appear and I want to Also Close the window but not want to close the MDI....I already used trigger "When_window_closed" on moudule level but i dont want to close the total MDI i want to close only the simple window that contain data block. Please help it is an urgent to me....
Thanks to All.

I think you need to use 'HIDE_WINDOW('window_name') trigger behind the button or anywhere you want but first move your cursor to required datablock for example I have an employee form open and want to assign a new department to him but this department does not exist yet, i click on 'new department' button it opens a new window (DEPT) to create new department, after entering department i want to send back my cursor to employee form and close this window when I click on 'save' button on department form.

GO_BLOCK('EMP');
HIDE_WINDOW('DEPT');