Gets or set a value indicating whether the primary button is checkable.
public bool Checkable { get; set; }
The following example shows how set a Ribbon
TXTextControl.Windows.Forms.Ribbon.RibbonSplitButton ribbonSplitButton = new TXTextControl.Windows.Forms.Ribbon.RibbonSplitButton();
ribbonSplitButton.Text = "My RibbonSplitButton";
ribbonSplitButton.ButtonEnabled = true;
ribbonSplitButton.Checkable = true;
//Now the 'checked' property can be set.