Thanks for the reply Mike.  I ended up using an UltraButton and handling the events myself.  For my instruction though, perhaps you'd take a look at the following:

I attempted to use a creation filter, but there doesn't appear to be a good way to do this with the UltraDropdownButton control.  Or at least, if there is, I'm missing it.

I first tried:

Friend Class NoDropDownButtonCreationFilter

    Implements Infragistics.Win.IUIElementCreationFilter

    Public Sub AfterCreateChildElements(parent As Infragistics.Win.UIElement) Implements Infragistics.Win.IUIElementCreationFilter.AfterCreateChildElements

        Dim editorElement As Infragistics.Win.Misc.DropDownButtonControlUIElement = CType(parent, Infragistics.Win.Misc.DropDownButtonControlUIElement)

        If editorElement IsNot Nothing Then

            Dim dropdownButtonElement As Infragistics.Win.DropDownButtonUIElement = CType(editorElement.GetDescendant(GetType(DropDownButtonUIElement)), DropDownButtonUIElement)

            Dim textElement As Infragistics.Win.EditorWithTextUIElement = CType(editorElement.GetDescendant(GetType(EditorWithTextUIElement)), EditorWithTextUIElement)

            If dropdownButtonElement IsNot Nothing AndAlso editorElement.ChildElements.Contains(dropdownButtonElement) Then

                editorElement.ChildElements.Remove(dropdownButtonElement)

                If textElement IsNot Nothing Then

                    textElement.Rect = editorElement.RectInsideBorders

                End If

            End If

        End If

    End Sub

    Public Function BeforeCreateChildElements(parent As Infragistics.Win.UIElement) As Boolean Implements Infragistics.Win.IUIElementCreationFilter.BeforeCreateChildElements

        Return False

    End Function

End Class

However, the parent  only has one ChildElement which is Infragistics.Win.Misc.SplitButtonUIElement.  There are no ChildElements on that class so I see no way to remove one of them from the collection.  Do you have any suggestions about where to hide the dropdownbutton in this case?

Hi,

Yeah, it looks like there is no separate element for the dropdown arrow, so you would have to use a DrawFilter instead of CreationFilter to stop the SplitButtonUIElement from drawing the arrow.

This is a bit tricky, too, because the drodpown arrow is drawn using operating system themes, so you would have to turn off Themes and also cancel the BeforeDrawForeground phase of the drawing.

Turning off themes can be done via the appearance:

this.ultraDropDownButton1.Appearance.ThemedElementAlpha = Alpha.Transparent;

And the DrawFilter would look something like this:

    public class MyDrawFilter : IUIElementDrawFilter
    {
        #region IUIElementDrawFilter Members

        public bool DrawElement(DrawPhase drawPhase, ref UIElementDrawParams drawParams)
        {
            return true;
        }

        public DrawPhase GetPhasesToFilter(ref UIElementDrawParams drawParams)
        {
            if (drawParams.Element is SplitButtonUIElement)
                return DrawPhase.BeforeDrawForeground;

            return DrawPhase.None;
        }

        #endregion
    }

Hi Mike,

i also need an UltraDropDownButton in our application, which can hide/show (or enable/disable) the drowdown-arrow on demand. I've tried your suggested the drawfilter-code, but it does not change the drawing-behaviour of the button, the arrow is still visible and accessable.

I'm also wondering which part of the filter does influence the arrow drawing. Or is this just a filter example and there is the code missing for hiding the arrow? Can you please give me an example then, how to hide or disable the drowdown-arrow?

Thank you and best regards,

Daniel

Hi Daniel, 

It looks like either the elements changes over the years, or else I made a mistake in my original code. I sed the wrong UIElement there. You have to use SplitButtonDropDownUIElement instead of SplitButtonUIElement.

public class MyDrawFilter : IUIElementDrawFilter
{
#region IUIElementDrawFilter Members
public bool DrawElement(DrawPhase drawPhase, ref UIElementDrawParams drawParams)
{
return true;
}
public DrawPhase GetPhasesToFilter(ref UIElementDrawParams drawParams)
{
if (drawParams.Element is SplitButtonDropDownUIElement)
return DrawPhase.BeforeDrawForeground;
return DrawPhase.None;
}
#endregion
}

Hi Mike,

this works, thank you!

Best regards,

Daniel