Reg : TCL Tk GUI

[msrikanth]

Hi Everyone,
I need some help in Tcl Tk Gui Application Development. In that GUI i need 2 drop down lists 1) Subject : , so here a list of subjects will be present
2) Assignment : , So here depending upon the subject again a list of assignments related to that subject should be there

After selecting both , based on the selection i need to perform some linux commands in the directory in which this GUI is invoked.

I am attaching the sample GUI image to clarification

Thanks
Srikanth M.