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esriViewDrawPhase.esriViewDrawBackground relates what?

Question asked by kjulistened on Nov 1, 2013
Latest reply on Nov 1, 2013 by kjulistened
Hi,there.
I got some information ref esri help:http://resources.esri.com/help/9.3/arcgisengine/dotnet/2a1de2c3-0c3e-412e-8e1e-1a29d657be8c.htm

It says that esriViewDrawBackground relates to the 'bottom layer',I confuse about this and I saw some code like:
axMapControl1.PartialRefresh(esriViewDrawPhase.esriViewBackground, null, null);

after tracking a new regtangle to show.

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