vcl combobox doesn't always show that it has focus

Question

When I tab from another control to a combo box it shows the box with a dotted line around the text, but when I set the control to be active programmatically, it doesn\'t show th

Answer 1

To make the focus rectangle appear on a combo box, when setting the focus programmatically, you can use the following code:

ComboBox.SetFocus; 
ComboBox.Perform(WM_SYSKEYDOWN, VK_TAB, 0);