Problem with custom widget

[jacek]

I was thinking Q_OBJECT macro is used for Signals and Slots.

It is, but the problem was that you didn't declare ChooseColor() and ExecPopupMenu( int, int ) as slots.

Except using methods like setColumnWidth(), setRowHeight(), is there any function which will create all cell of same width and height.

You could try changing the size hint for QTableWidgetItems.