How to get entry value of a TCL/TK GUI ?

Hi guys,

I am new in Tk programming and I have just created a Tk window using the tutorial in the HyperWorks GUI Toolkit Demos.

My window is now finished but I have a problem to use it, I don't manage to get the entry value of a Combobox and 'string fields'.

How can I do that ?

Thanks for your help