added textbox to sliderbar
***NO_CI***
added images for the different kinds of pen types in the thickness action bar
***NO_CI***
The color of the BtnSelectedColor has now the right color when you reaccess it afterwards (was per default white). The color for the Transparent option was now changed from Black to White to make it easier to read.
***NO_CI***
Changed the SliderThicknessTextBox from IsEnabled="False" to IsHitTestVisible="False"
***NO_CI***
Merge TFS Changeset 1131