Issue: 
You create a $$ViewTemplate for Whatever. 
The Whatever view has multiple levels of categories. 
You are using a drop down or action links to dynamically select a single top level category 
 
Problem: 
Clicking/opening a triangle for one of the secondary levels causes the view to revert back to the "default" value of the view when it first loaded. 
 
Solution: 
Do not use the single category view option. Instead use the web parameter "&RestrictToCategory=value" in the url. Have the url that your drop down or text/button actions use a formula similar to the following: 
 
db:=@Subset(@DbName; -1); 
view:= @ReplaceSubstring(@Subset(@ViewTitle; -1); "\\"; " "); 
@URLOpen("/" + db + "/" + view + "!OpenView&RestrictToCategory=F")
  
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