FIX. RadMultiColumnComboBox. Setting the FormatString to a numeric column to some currency format and changing the column position results in displaying an invalid currency symbol.

When you select a row by pressing the left mouse button twice, you will select a wrong row if RadMultiColumnComboBox has filter applied.

When copy the RadMultiColumnComboBox control it pastes the underling grid as a separate control.

Workaround: Place the RadMultiColumnComboBox on a UserControl, and introduce the desired settings there. Then reuse the user control in your forms.

If value member's column is not included in EditorControl (the grid) SelectedValue property always returns null.

When RadGridView is unbound and you try to create the columns for the RadMultiColumnComboBox manually, RadGridView throws an exception: "Cannot find column bound to 'field name'"

When you have a GridViewMultiComboBoxColumn in RadGridView, you can't set a custom size to the dropdown easily.

The RadMultiColumnComboBox control does not update its selection when the user types text in the text field.
The expected behavior is that when the user types text and there is a databound item that matches the input, it should be selected. Otherwise, the current selection in the list should be cleared.

TextChanged event of RadMultiColumnComboBox is not fired on many occasions.