Build failure fix

I found a build failure introduced with commit 902ebf... .

It seems to be regarding a missing static qualifier for Type.CHANNEL enum import in .../waveform/EditWaveformPropertiesDialog.java.
![capture3](https://f.cloud.github.com/assets/2928980/2493717/3e83aaf2-b2a4-11e3-8a11-f59ac995c7b6.PNG)