• Brief
• Object relation
• UserInterface
• UIState
• UIElement
• Initial setup
• Initialize the UI
• Updating and drawing the UI
• Showing the UI
• State history
• Adding elements
• Adding some text
• Centering element
• Header-like text
• Centering the UIPanel
• Interaction with UIElements
• Events
• Tooltip on hover
• Interactions when the UI shows or hides
• Custom UIElement