Hi,
This is already fixed. The fix will be included in v3.1. Many controls have been reviewed in v3.1 relating to this issue.
In the meantime, you can go in file :
-Xceed.Wpf.Toolkit/DateTimeUpDown/Themes/Aero2.NormalColor.xaml (for windows 8 and up)
-Xceed.Wpf.Toolkit/DateTimeUpDown/Themes/Generic.xaml (for other windows)
In the style with x:Key ="DateTimeUpDown",
Remove "<Setter Property="Focusable" Value="False"/>"
Also, in "PART_TextBox"
replace "IsTabStop="{TemplateBinding IsTabStop}"" with "IsTabStop="True""
This is already fixed. The fix will be included in v3.1. Many controls have been reviewed in v3.1 relating to this issue.
In the meantime, you can go in file :
-Xceed.Wpf.Toolkit/DateTimeUpDown/Themes/Aero2.NormalColor.xaml (for windows 8 and up)
-Xceed.Wpf.Toolkit/DateTimeUpDown/Themes/Generic.xaml (for other windows)
In the style with x:Key ="DateTimeUpDown",
Remove "<Setter Property="Focusable" Value="False"/>"
Also, in "PART_TextBox"
replace "IsTabStop="{TemplateBinding IsTabStop}"" with "IsTabStop="True""