Question: Clarification on Plot Builder input

Just a quick question again: if I create a function by way of, say: f := x->2x; then I can't use the plot builder by right-clicking the result. However, defining an expression as f := 2x; works fine. I realize that the plot builder pulls in the function literally and it doesn't like the format of x->2x. However, I'm just finishing up a student manual, and since it is a tad bit confusing, I just wanted to make sure that this is the intended behaviour, and that I'm not missing anything. Thanks again, /Ivan
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