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Hello, Cesar,
RadMultiColumnComboBoxElement, which is used as an editor in RadGridView's GridViewMultiComboBoxColumn, offers the CreatePopupForm method which can be overridden in a derivative. Thus, you can create a custom RadMultiColumnComboBoxElement and override its CreatePopupForm method where you can construct your own MultiColumnComboPopupForm. The custom editor can be applied in the EditorRequired event that RadGridView offers: https://docs.telerik.com/devtools/winforms/controls/gridview/editors/using-custom-editors
Another suitable control that can be hosted in a custom editor by using a RadHostItem is RadPopupEditor. It allows you to show any predefined or custom controls in its popup. Additional information about RadPopupEditor is available here: https://docs.telerik.com/devtools/winforms/controls/editors/popupeditor/popupeditor
Feel free to use this approach which suits your requirements best.
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
RadMultiColumnComboBoxElement, which is used as an editor in RadGridView's GridViewMultiComboBoxColumn, offers the CreatePopupForm method which can be overridden in a derivative. Thus, you can create a custom RadMultiColumnComboBoxElement and override its CreatePopupForm method where you can construct your own MultiColumnComboPopupForm. The custom editor can be applied in the EditorRequired event that RadGridView offers: https://docs.telerik.com/devtools/winforms/controls/gridview/editors/using-custom-editors
Another suitable control that can be hosted in a custom editor by using a RadHostItem is RadPopupEditor. It allows you to show any predefined or custom controls in its popup. Additional information about RadPopupEditor is available here: https://docs.telerik.com/devtools/winforms/controls/editors/popupeditor/popupeditor
Feel free to use this approach which suits your requirements best.
I hope this information helps. If you need any further assistance please don't hesitate to contact me.
Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik
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