Key ShortCuts

Use the code below to open the drop-down menu using shortcuts(Please refer to the help section about adding shortcuts to controls for adding the shortcut itself):

Adding sub items

public DropDownButton()
{
    InitializeComponent();
    this.radDropDownButton1.DropDownButtonElement.Shortcuts.Add(new RadShortcut(Keys.Control, Keys.N));
    this.radDropDownButton1.DropDownButtonElement.Click += new EventHandler(DropDownButtonElement_Click);
}
void DropDownButtonElement_Click(object sender, EventArgs e)
{
    this.radDropDownButton1.ShowDropDown();
}

Public Sub New()
    InitializeComponent()
    Me.radDropDownButton1.DropDownButtonElement.Shortcuts.Add(New RadShortcut(Keys.Control, Keys.B))
    AddHandler Me.radDropDownButton1.DropDownButtonElement.Click, AddressOf DropDownButtonElement_Click
End Sub
Sub DropDownButtonElement_Click(ByVal sender As Object, ByVal e As EventArgs)
    Me.radDropDownButton1.ShowDropDown()
End Sub