Fixed first level tree node

src/imHelpers.cpp

@@ -145,7 +145,7 @@ bool ofxImGui::BeginTree(const std::string& name, Settings& settings)
 	ImGui::SetNextTreeNodeOpen(true, ImGuiSetCond_Appearing);
 	if (settings.treeLevel == 0)
 	{
-		result = ImGui::CollapsingHeader(GetUniqueName(name));
+		result = ImGui::TreeNodeEx(GetUniqueName(name), ImGuiTreeNodeFlags_Framed | ImGuiTreeNodeFlags_NoAutoOpenOnLog);
 	}
 	else
 	{
@@ -164,10 +164,7 @@ bool ofxImGui::BeginTree(const std::string& name, Settings& settings)
 //--------------------------------------------------------------
 void ofxImGui::EndTree(Settings& settings)
 {
-	if (settings.treeLevel > 1)
-	{
-	    ImGui::TreePop();
-	}
+	ImGui::TreePop();
 
 	settings.treeLevel = std::max(0, settings.treeLevel - 1);