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delphivcl

Add a button or label to a combobox

How can I add a button with OnClick event, or a label, to the bottom of the drop-down list for a VCL TComboBox? Even if it is empty.

Solution

  • Native ComboBox controls do not support what you are asking for.

    However, you can use the Win32 API GetComboBoxInfo() function to get the HWND of the drop-down list and then use the Win32 API to manipulate it directly, like adding child windows to it, subclassing it to intercept window messages, etc.