Removed error returns from [all controls].SetText() and Window.SetTitle().

button.go

@@ -27,15 +27,15 @@ func NewButton(text string) (b *Button) {
 }
 
 // SetText sets the button's text.
-func (b *Button) SetText(text string) (err error) {
+func (b *Button) SetText(text string) {
 	b.lock.Lock()
 	defer b.lock.Unlock()
 
 	if b.created {
-		return b.sysData.setText(text)
+		b.sysData.setText(text)
+		return
 	}
 	b.initText = text
-	return nil
 }
 
 // Text returns the button's text.

checkbox.go

@@ -25,15 +25,15 @@ func NewCheckbox(text string) (c *Checkbox) {
 }
 
 // SetText sets the checkbox's text.
-func (c *Checkbox) SetText(text string) (err error) {
+func (c *Checkbox) SetText(text string) {
 	c.lock.Lock()
 	defer c.lock.Unlock()
 
 	if c.created {
-		return c.sysData.setText(text)
+		c.sysData.setText(text)
+		return
 	}
 	c.initText = text
-	return nil
 }
 
 // Text returns the checkbox's text.

label.go

@@ -22,15 +22,15 @@ func NewLabel(text string) *Label {
 }
 
 // SetText sets the Label's text.
-func (l *Label) SetText(text string) (err error) {
+func (l *Label) SetText(text string) {
 	l.lock.Lock()
 	defer l.lock.Unlock()
 
 	if l.created {
-		return l.sysData.setText(text)
+		l.sysData.setText(text)
+		return
 	}
 	l.initText = text
-	return nil
 }
 
 // Text returns the Label's text.

lineedit.go

@@ -33,15 +33,15 @@ func NewPasswordEdit() *LineEdit {
 }
 
 // SetText sets the LineEdit's text.
-func (l *LineEdit) SetText(text string) (err error) {
+func (l *LineEdit) SetText(text string) {
 	l.lock.Lock()
 	defer l.lock.Unlock()
 
 	if l.created {
-		return l.sysData.setText(text)
+		l.sysData.setText(text)
+		return
 	}
 	l.initText = text
-	return nil
 }
 
 // Text returns the LineEdit's text.

window.go

@@ -31,19 +31,15 @@ func NewWindow(title string, width int, height int) *Window {
 }
 
 // SetTitle sets the window's title.
-func (w *Window) SetTitle(title string) (err error) {
+func (w *Window) SetTitle(title string) {
 	w.lock.Lock()
 	defer w.lock.Unlock()
 
 	if w.created {
-		err = w.sysData.setText(title)
-		if err != nil {
-			return fmt.Errorf("error setting window title: %v", err)
-		}
-		return nil
+		w.sysData.setText(title)
+		return
 	}
 	w.initTitle = title
-	return nil
 }
 
 // SetSize sets the window's size.