Is it because you left the form's LOCKSCREEN = .T.?

>I have a form with a number of fields and a 2 page pageframe with a grid in each page. All of these have their .Visible = .F.
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>Also on the form is a container, a combobox and a command button. These are used to select a project number and once one is selected these controls .Visible=.F. and the others =.T.
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>When I run the form I can't see the container, combobox and command button, even though when I look in the debugger their .Visible=.T.. I know they are active though and the combobox has focus. If I hit F4 the combobox's list appears.
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>Any ideas on why they don't appear?