Gui: add SoColorBarLabel as workaround for a Coin3D bug

src/Gui/SoFCColorGradient.cpp

@@ -35,6 +35,7 @@
 #endif
 
 #include "SoFCColorGradient.h"
+#include "SoTextLabel.h"
 #include "DlgSettingsColorGradientImp.h"
 #include "MainWindow.h"
 #include "MDIView.h"
@@ -98,7 +99,7 @@ void SoFCColorGradient::setMarkerLabel(const SoMFString& label)
         for (int i = 0; i < num; i++) {
             SoTransform* trans = new SoTransform;
             SoBaseColor* color = new SoBaseColor;
-            SoText2    * text2 = new SoText2;
+            SoText2    * text2 = new SoColorBarLabel;
 
             trans->translation.setValue(0, -fStep, 0);
             color->rgb.setValue(0, 0, 0);