private static void OnEnableWatermarkChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (e.OldValue != null)
{
var enabled = (bool)e.OldValue;
if (enabled)
{
var comboBox = (CheckComboBox)d;
var behavior = GetWatermarkCheckComboBoxBehavior(comboBox);
behavior.Detach();
SetWatermarkCheckComboBoxBehavior(comboBox, null);
}
}
if (e.NewValue != null)
{
var enabled = (bool)e.NewValue;
if (enabled)
{
var comboBox = (CheckComboBox)d;
var behavior = new WatermarkCheckComboBoxBehavior(comboBox);
behavior.Attach();
SetWatermarkCheckComboBoxBehavior(comboBox, behavior);
}
}
}
private static void SetWatermarkCheckComboBoxBehavior(DependencyObject obj, WatermarkCheckComboBoxBehavior value)
{
obj.SetValue(WatermarkCheckComboBoxBehaviorProperty, value);
}