Show Icons in Splashscreen

Hello,

ive developed some nodes for knime and they are running fine. Know i want to display my nodes with a unique icon.

 

Ive imported my icons as 16x16 pixels and in the left window the icons are displayed. When i pull my node into the right screen there is only a "?" displayed.

 

Kann anyone help me with this issue?

Have you included them in the build?