I have an application where I have a product search text field. To implement a predictive text like feature, I hid a combo box behind the text box that populates with the appropriate products. That all works fine and dandy. The problem is the cursor does not show on the form while the combo box is dropped. I can still use the cursor to select the results from the combo box, but it is invisible until I click something on the form.
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Do you have the combobox dropdown style as DropDownList?
Also why not use the AutoComplete Mode to accomplish predictive text feature
http://msdn.microsoft.com/query/dev10.query?appId=Dev10IDEF1&l=EN-US&k=k(SYSTEM.WINDOWS.FORMS.COMBOBOX.AUTOCOMPLETEMODE);k(SYSTEM.WINDOWS.FORMS.COMBOBOX);k(VS.PROPERTIES);k(TargetFrameworkMoniker-%22.NETFRAMEWORK%2cVERSION%3dV3.5%22)&rd=true