VTK-3157 Added source button to ckeditor-menu for new message field.
VTK-3157 Added source button to ckeditor-menu for new message field.

vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk,vtkio/vtk