To be able to hide the selection rectangle you can remove the SelectionUILayer. This can be achieved creating a custom UI layers builder. You could use the following code:
CustomWorksheetUILayersBuilder : WorksheetUILayersBuilder
In the constructor of your control you can use the following line:
If you want to remove it on some event this can be achieved little hacky. First you have to set the custom builder and then to change the active worksheet to another one and then return the previous active worksheet, this way you will force the layers to be build.
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