Displays the type of currently loaded image data, which can then be changed to volume, projection, etc.
var dm = VQ.dataManager();
var old = dm.getDataTypeString();
VQ.debug("DataType: "+old);
VQ.showMessage("Currently data is:\n"+old);
var type = VQ.getItem("Change Type",
"New Type",
dm.dataTypeNames(),
dm.dataTypeNames().indexOf(old));
dm.setDataTypeAll(type);
VQ.debug("DataType: "+dm.getDataTypeString());