Ian, I have found the solution. I have made some tests.
One of these tests was the following program:
int main(void)
{
Window *win = new Window(200,200);
win->begin();
win->end();
win->show();
CheckButton *check = new CheckButton(50, 20, 25, 25);
win->add(check);
Input *in = new Input(50, 50, 100, 25);
win->add(in);
return run();
}
The solution is adding the widgets to the main window.
winfried
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