Re: [Vala] Button not visible

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... and there are many other fancy Gtk layout containers:

GtkBox — A container box
GtkGrid — Pack widgets in rows and columns
GtkRevealer — Hide and show with animation
GtkListBox — A list container
GtkFlowBox — A container that allows reflowing its children
GtkStack — A stacking container
GtkStackSwitcher — A controller for GtkStack
GtkStackSidebar — An automatic sidebar widget
GtkActionBar — A full width bar for presenting contextual actions
GtkHeaderBar — A box with a centered child
GtkOverlay — A container which overlays widgets on top of each other
GtkButtonBox — A container for arranging buttons
GtkPaned — A widget with two adjustable panes
GtkLayout — Infinite scrollable area containing child widgets and/or
custom drawing
GtkNotebook — A tabbed notebook container
GtkExpander — A container which can hide its child
GtkOrientable — An interface for flippable widgets
GtkAspectFrame — A frame that constrains its child to a particular
aspect ratio
GtkFixed — A container which allows you to position widgets at fixed
coordinates