Added getter and setter for maxWidth and maxHeight for button groups.

lib/pixi/button.js

@@ -253,10 +253,10 @@ export default class Button extends PIXI.Container {
         })
 
         this.button.on('pointerout', this.onEnd.bind(this))
-		this.button.on('pointercancel', this.onEnd.bind(this))
-		this.button.on('pointerupoutside', this.onEnd.bind(this))
-		this.button.on('pointertap', this.onEnd.bind(this))
-		this.button.on('scroll', this.onEnd.bind(this))
+        this.button.on('pointercancel', this.onEnd.bind(this))
+        this.button.on('pointerupoutside', this.onEnd.bind(this))
+        this.button.on('pointertap', this.onEnd.bind(this))
+        this.button.on('scroll', this.onEnd.bind(this))
 
         // eslint-disable-next-line no-unused-vars
         this.button.on('pointerdown', e => {
@@ -689,12 +689,12 @@ export default class Button extends PIXI.Container {
             this.icon.tint = value
         }
     }
-	
-	onEnd(event) {
-		this.capture(event)
-		TweenLite.to([this.button, this.content], this.theme.fast, {
-			alpha: 1,
-			overwrite: 'none'
-		})
-	}
+
+    onEnd(event) {
+        this.capture(event)
+        TweenLite.to([this.button, this.content], this.theme.fast, {
+            alpha: 1,
+            overwrite: 'none'
+        })
+    }
 }

lib/pixi/buttongroup.js

@@ -371,6 +371,34 @@ export default class ButtonGroup extends PIXI.Container {
         this.buttons.forEach(it => (it.disabled = value))
     }
 
+    /**
+     * Gets or sets the maximum width of the button group for stacking. Usefull when you want to resize the available space.
+     *
+     * @member {number}
+     */
+    get maxWidth() {
+        return this.opts.maxWidth
+    }
+
+    set maxWidth(value) {
+        this.opts.maxWidth = value
+        this.layout()
+    }
+
+    /**
+     * Gets or sets the maximum height of the button group for stacking. Usefull when you want to resize the available space.
+     *
+     * @member {number}
+     */
+    get maxHeight() {
+        return this.opts.maxHeight
+    }
+
+    set maxHeight(value) {
+        this.opts.maxHeight = value
+        this.layout()
+    }
+
     /**
      * Searches all buttons of the button group and returns the maximum width of one button.
      *