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VB .Net Widnows app ignoring some keys

I have a vb.net windows app that has been converted several times.  Now in VS 2012, it appears to be ignoring some keys.  For example:

in a combobox, using the up & down arrows to scroll thru the collection to make selection.  The tab key also appears tricky.  There are times when the tab order is ignored and times when forcing the focus to where you want next location to be is ignored.  

Most is under control if I could learn what to do to have the up and down arrows to work in a combobox to scroll thru the collection.

Also users would like to be able to hit alt F4 to close the extension that does not work on this app.
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garyinmiami2003
Asked:
garyinmiami2003
1 Solution
 
Luis PérezSoftware Architect in .NetCommented:
The up & down keys on a combo is a windows-built behaviour, so it not depends in any way of VB nor the Visual Studio version. Are you sure your combobox has the DropDownList value set in the DropDownStyle property?

The same for Alt+F4 keystroke. It's a windows-built behaviour to close the foreground window. Really this is very strange.
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