class HistogramCarrot;
class HistogramAuto;
class HistogramPlot;
+class HistogramSumFrames;
class HistogramSplit;
class HistogramMode;
class HistogramReset;
-class HistogramSelect;
class HistogramLogSlider;
-class HistogramFrames;
class HistogramText;
class HistogramCanvas;
class HistogramWindow;