Hi Matt,

 The Steps to Reproduce the question as folows:

1.Create a new Component base on UltraTextEditor, then add a right button to the ultraTextEditor.

2.compile

3.Create a new form,drag the component created in step 1 to the form.

4.compile

5.Relocate the component, and then Compile.

6.Close the form, and then open the form.Now the component has tows right buttons.

7.Repeat the steps 5,6. The right button in the component add by
itself one at a time.

     Thanks.

 If you're deriving from the control, which it sounds like you are, you will have to make sure that you're not adding the same button multiple times.  Where are you adding the button?  What's happening here is that you add the button and the code serializes the ButtonsRight collection, so you'll have serialized code adding the button.  Now when you re-load the designer, your constructor will add a button and then the designer will load the serialized button, leading to you having two buttons.  One approach might be to override OnCreateControl, call the base first, and then check to see if the button's Key exists in the ButtonsRight collection before adding it.

-Matt

Hi Matt,

   Thanks, I resolved the problem followes you said. The Code I writen as follows:

    public partial class GridCombo : UltraTextEditor
    {
        public GridCombo()
        {
            InitializeComponent();
        }

        protected override void OnCreateControl()
        {
            base.OnCreateControl();
            if (DesignMode || ButtonsRight.Exists("DropDownButton"))
                return;

            DropDownEditorButton editorButton = new DropDownEditorButton();
            editorButton.Key = "DropDownButton";
            editorButton.RightAlignDropDown = Infragistics.Win.DefaultableBoolean.False;
            editorButton.AutoFocus = false;
            editorButton.Control = popGrid1; // popGrid1 is an User Control

            ButtonsRight.Add(editorButton);
        }
    }