Your application uses a blank label with an opaque background to display the colors. You need to add the label and set its properties.
To add a label:
A label with the text jLabel1 is displayed in the Form Editor. In the Component Inspector, a node named jLabel1 [JLabel] is displayed (and highlighted) in the tree view and the properties for the component are displayed in the Properties pane. Source code for the label is displayed in the Source Editor.
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