setSelectionPosition() can't get to select text

[pr6i6e6st]

edit: solved! had to use the onChar() function instead of calling the function with onValueChanged()

hey guys. i'm trying to get an autocomplete working for a search function and the autocomplete part is working, but i'm not getting an actual selection in the UI. my Debug pulls up numbers, i'm just not getting the selection so that the autocomplete is removed if one keeps typing.
here's what i've got. is it the control? or am i missing a crucial step?

                      <basicstring name="searchname">
				<anchored position="insidetopleft" height="25">
					<left anchor="center" offset="-80" />
					<top offset="80" />
					<right anchor="center" offset="80" />
				</anchored>
				<empty text="~NPC name~" />
				<script>
					function onInit()
						LastCheck = 0;
						LoopBreaker = true;
					end
					function onValueChanged()
						local testText = Module.getModules();
						local DataSourceCheck = window.npcdatasource.getValue();
						local DBNPCs = DB.getChildren("npc");
						local aAutoFill = {};
-----------clipped irrelevant lines here ------						
						if DataSourceCheck == 0 then
							if #getValue() &gt; 2 then
								DBAutocomplete();
							end
-----------clipped irrelevant lines here ------
						end
					end
					function DBAutocomplete()
						local DBNPCs = DB.getChildren("npc");
						local aAutoFill = {};
						for k,w in pairs(DBNPCs) do
							local kDatabaseNode = DB.getChild("npc", k);
							local s = DB.getValue(kDatabaseNode, "name", "");
							if s ~= "" then
								table.insert(aAutoFill, s);
							end
						end
						Debug.console("getCursorPosition(), #getValue()", #getValue(), getCursorPosition());
						if getCursorPosition() == #getValue() then
							local Curser = getCursorPosition();
							local AutoComplete = StringManager.autoComplete(aAutoFill, getValue(), true);
							if AutoComplete then
								Debug.console(AutoComplete);
								if getValue() ~= "" then
									local sNewValue = string.sub(getValue(), 1, getCursorPosition()-1) .. AutoComplete .. string.sub(getValue(), getCursorPosition());
									currentType = getValue();
									setValue(currentType .. AutoComplete);
									setSelectionPosition(#getValue());
									Debug.console("#getValue(), getCursorPosition(), #AutoComplete, getSelectionPosition()", #getValue(), getCursorPosition(), #AutoComplete, getSelectionPosition());
								end
							end
						end
					end
					function endLoopBreaker()
						LoopBreaker = true;
					end
				</script>
			</basicstring>