This interface allows WL8 to communicate with a chart in a ChildWindow instance. The WealthLab.WPF Chart class implements IChart. If you are implementing a ChildWindow in a Wealth-Lab extension, and it contains a chart, you can override the Chart property to return an instance of this interface.
void ChartThisSymbol(string symbol, DataSet ds)
void PushKey(Key key)
WL8 calls this when the chart is visible and the user presses a keystroke. The Chart class in WealthLab.ChartWPF implements this call by putting the character pressed into the symbol entry field, and handling other special keystrokes such as backspace, and control left/right arrow.