Hello,
The latest version of this library has a small issue. In WPF mode, if you set a UIElement in the child class of CSDeskbandWpf, it will not stretch to the whole width of the deskband. Instead it will take the minimum width and the deskband will shrink to its size, leaving the rest of the deskband area empty.
To solve this issue, a small patch is needed to the CSDeskBandWpf class constructor. After creating HwndSource using HwndSourceParameters, assign the SizeToContent property on it to SizeToContent.Manual and it will behave the same as previous versions.