increase width of labels so they don't get clipped

Author: tschie

src/main/resources/fxml/rgb_renderer.fxml

@@ -24,7 +24,7 @@
 <StackPane fx:controller="com.esri.samples.raster.rgb_renderer.RgbRendererController" xmlns:fx="http://javafx.com/fxml"
            stylesheets="/css/style.css">
     <MapView fx:id="mapView"/>
-    <VBox StackPane.alignment="TOP_LEFT" maxWidth="300" maxHeight="50" styleClass="panel-region" spacing="10">
+    <VBox StackPane.alignment="TOP_LEFT" maxWidth="320" maxHeight="50" styleClass="panel-region" spacing="10">
         <HBox spacing="10">
             <Label text="Stretch type"/>
             <ComboBox fx:id="stretchTypeComboBox"/>
@@ -42,7 +42,7 @@
         </VBox>
         <!--Min/Max-->
         <GridPane fx:id="minMaxGroup" hgap="10" vgap="10" managed="${minMaxGroup.visible}">
-            <Label text="R" GridPane.rowIndex="0" GridPane.columnIndex="0"/>
+            <Label text="R" GridPane.rowIndex="0" GridPane.columnIndex="0" minWidth="15"/>
             <Spinner fx:id="minRedSpinner" min="0" max="255" initialValue="0" editable="true" GridPane.rowIndex="0"
                      GridPane.columnIndex="1"/>
             <Spinner fx:id="maxRedSpinner" max="255" initialValue="255" editable="true" GridPane.rowIndex="0"