diff --git a/src/visual/InteractiveCanvas.cpp b/src/visual/InteractiveCanvas.cpp
index d529b76..9015de9 100644
--- a/src/visual/InteractiveCanvas.cpp
+++ b/src/visual/InteractiveCanvas.cpp
@@ -19,7 +19,7 @@
 
 InteractiveCanvas::InteractiveCanvas(wxWindow *parent, int *attribList) :
         wxGLCanvas(parent, wxID_ANY, attribList, wxDefaultPosition, wxDefaultSize,
-        wxFULL_REPAINT_ON_RESIZE), parent(parent), shiftDown(false), altDown(false), ctrlDown(false), centerFreq(0), bandwidth(0), lastBandwidth(0), isView(
+        wxFULL_REPAINT_ON_RESIZE| wxWANTS_CHARS), parent(parent), shiftDown(false), altDown(false), ctrlDown(false), centerFreq(0), bandwidth(0), lastBandwidth(0), isView(
         false) {
     mouseTracker.setTarget(this);
 }