Hello Drew Greenwell,
Using the code from the previous post you can get the id of the currently selected item. Once you have the IContent object, you can call GetMetaData method and get the category that is associated with this item. Then you can filter the second control by category using ContentFilterBuilder class. You can perform the filtering inside CreateChildControls method
ContentFilterBuilder filterBuilder =
// we assume that you have the content item
categoryName = (
note that you should change the value of ContentItemKey
property for the second control - that will be filtered by categories, otherwise it will read the ContentItemKey from the QueryString and your filtering will not apply. You can change the value of this property form the ControlDesigner >> Advanced tab >> QueryString keys.
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