GameObject Selection popup from another EditorWindow problem

the problem is the gameobject window picker just disappears after a clicking somewhere.
problem video: - YouTube

// vearth class
        void OnEnable() {
                
            Vearth target = this;
            int TOP_PADDING = 2;

            m_TreesObjectsSO = new SerializedObject(target);
            m_ReorderableList = new ReorderableList(m_TreesObjectsSO, m_TreesObjectsSO.FindProperty("TreesObjects"), true, true, true, true);
        
            m_ReorderableList.drawHeaderCallback = (rect) => EditorGUI.LabelField(rect, "Trees");
            m_ReorderableList.drawElementCallback = (Rect rect, int index, bool isActive, bool isFocused) =>
            {
                rect.y += TOP_PADDING;
                rect.height = EditorGUIUtility.singleLineHeight;
                EditorGUI.PropertyField(rect, m_ReorderableList.serializedProperty.GetArrayElementAtIndex(index), GUIContent.none);
            };

        }

// ongui somewhere 

 EditorGUILayout.BeginVertical(SectionStyle); {
                            Vearth vearth = EditorWindow.GetWindow<Vearth>();

                            if(vearth.m_TreesObjectsSO != null)
                            {
                                vearth.m_TreesObjectsSO.Update();
                                vearth.m_ReorderableList.DoLayoutList();
                                vearth.m_TreesObjectsSO.ApplyModifiedProperties();
                            }
                        } EditorGUILayout.EndVertical();

Please i need help