Sorry that I don't understand in the content in the link. It is too complicated to me.

Is there any simple answers for me to correct the code??

No, there is no simpler way to do this.

All you have to do is copy this class into your project.

Public Class MiddleAlignDrawFilter
Implements IUIElementDrawFilter
#Region "IUIElementDrawFilter Members"

    Private Function IUIElementDrawFilter_DrawElement(ByVal drawPhase As DrawPhase, ByRef drawParams As UIElementDrawParams) As Boolean Implements IUIElementDrawFilter.DrawElement
        drawParams.AppearanceData.TextVAlign = VAlign.Middle
        Return False
    End Function

    Private Function IUIElementDrawFilter_GetPhasesToFilter(ByRef drawParams As UIElementDrawParams) As DrawPhase Implements IUIElementDrawFilter.GetPhasesToFilter
        If TypeOf drawParams.Element Is EditorWithTextDisplayTextUIElement Then
            Return DrawPhase.BeforeDrawForeground
        End If

        Return DrawPhase.None
    End Function

#End Region

End Class

Then set the DataFilter DrawFilter property on the UltraComboEditor to a new instance of the MiddleAlignDrawFilter class.

This will only work when the UltraComboEditor is not in edit mode (does not have focus). When it has focus, it is not possible to align multiline text vertically within the control.

When I set the new instance of MiddleAlignDrawFilter class to UltraTextEditor.DataFilter, It says that cannot cast from MiddleAlignDrawFilter  to IEditorDataFilter.

what can I do? Where is something wrong??

Oops, sorry about that, that was a typo on my part.

The property is DrawFilter not DataFilter.