Hi,
Yes, removing the StackPanel changes the style of the Button and the textbox to use the ToolBar.TextBoxStyle and ToolBar.ButtonStyle. Unfortunately, the Toolkit's controls don't have a Toolbar style.
-Xceed.Wpf.Toolkit/DropDownButton/Themes/Generic.xaml
Yes, removing the StackPanel changes the style of the Button and the textbox to use the ToolBar.TextBoxStyle and ToolBar.ButtonStyle. Unfortunately, the Toolkit's controls don't have a Toolbar style.
I believe redefining the style of the DropDownButton and IntegerUpDown would do the job. These files are located here :
-Xceed.Wpf.Toolkit/NumericUpDown/Themes/Generic.xaml-Xceed.Wpf.Toolkit/DropDownButton/Themes/Generic.xaml