lazy initialization of highlight pens and brushes for DebugVariableViewer
Constructors wx.Pen() and wx.Brush() require wx.App to exist already.
That causes crash during import of the control,
because import is done before calling main application code.
These classes are intended for use server-side.e.g. in a django view.py : from pyjs.jsonrpc.django import JSONService, jsonremote jsonservice = JSONRPCService() @jsonremote(jsonservice) def test(request, echo_param): return "echoing the param back: %s" % echo_param