Fixed Design bug in OACTabbedPane and functionality in OACTitleBar

src/main/java/org/openautonomousconnection/oacswing/component/OACFrame.java

@@ -245,6 +245,12 @@ public class OACFrame extends JFrame {
         return (OACLayeredPane) super.getLayeredPane();
     }
 
+    /**
+     * Get the resize cursor for the given edge / corner of this frame.
+     * Required, since undecorated Frames cannot be resized by default
+     * @param e event passed by mouse adapter
+     * @return id of detected resize cursor
+     */
     private int getResizeCursor(MouseEvent e) {
         int x = e.getX();
         int y = e.getY();

src/main/java/org/openautonomousconnection/oacswing/component/OACTabbedPane.java

@@ -22,6 +22,24 @@ public class OACTabbedPane extends JTabbedPane implements OACComponent {
         super(tabPlacement, tabLayoutPolicy);
     }
 
+    @Override
+    public void addTab(String title, Component component) {
+        this.initOther(component);
+        super.addTab(title, component);
+    }
+
+    @Override
+    public void addTab(String title, Icon icon, Component component) {
+        this.initOther(component);
+        super.addTab(title, icon, component);
+    }
+
+    @Override
+    public void addTab(String title, Icon icon, Component component, String tip) {
+        this.initOther(component);
+        super.addTab(title, icon, component, tip);
+    }
+
     @Override
     public Component add(Component comp) {
         this.initOther(comp);

src/main/java/org/openautonomousconnection/oacswing/component/OACTitleBar.java

@@ -69,11 +69,10 @@ public class OACTitleBar extends OACPanel {
      * Adds a new tab.
      *
      * @param title tab title
+     * @param panel tab body
      */
-    public void addTab(String title) {
-        OACPanel placeholder = new OACPanel();
-        placeholder.setOpaque(false);
-        tabs.addTab(title, placeholder);
+    public void addTab(String title, OACPanel panel) {
+        tabs.addTab(title, panel);
     }
 
     private OACTabbedPane createTabs() {