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How to catch the arrow keys of a ComboDropDown control

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To catch the arrow keys of the ComboDropDown control, you need to derive from it and override its ProcessCmdKey as shown below:

[C#] //Derived ComboDropDown control public class MyComboDropDown : Syncfusion.Windows.Forms.Tools.ComboDropDown { protected override bool ProcessCmdKey(ref Message msg, Keys keyData) { if (keyData==Keys.Left ||keyData==Keys.Right || keyData==Keys.Up || keyData==Keys.Down) { MessageBox.Show("Arrow Key: " + keyData.ToString(),"MyComboDropDown"); } return base.ProcessCmdKey (ref msg, keyData); } }

[VB.NET] 'Derived ComboDropDown control Public Class MyComboDropDown   Inherits Syncfusion.Windows.Forms.Tools.ComboDropDown Protected Overrides Function ProcessCmdKey(ByRef msg As Message, ByVal keyData As Keys) As Boolean If keyData=Keys.Left ||keyData=Keys.Right Or keyData=Keys.Up Or keyData=Keys.Down Then MessageBox.Show("Arrow Key: " + keyData.ToString(),"MyComboDropDown") End If Return MyBase.ProcessCmdKey ( msg, keyData) End Function End Class

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