fix:cubes:imgui

Author: kfields

examples/01-cubes/cubes.cpp

@@ -218,7 +218,7 @@ class ExampleCubes : public ExampleApp {
 		ImGui::Checkbox("Write A", &a_);
 
 		ImGui::Text("Primitive topology:");
-		ImGui::Combo("", (int*)&pt_, s_ptNames, BX_COUNTOF(s_ptNames));
+		ImGui::Combo("##combo", (int*)&pt_, s_ptNames, BX_COUNTOF(s_ptNames));
 
 		ImGui::End();