private void BuildWidget ()
{
alignment = new Alignment (0.5f, 0.5f, 1f, 0f);
alignment.SetPadding (1, 1, 3, 3);
VisibleWindow = false;
box = new HBox ();
entry = new FramelessEntry (this);
entry.UseNativeContextMenus ();
filter_button = new HoverImageButton (IconSize.Menu, "md-searchbox-search");
clear_button = new HoverImageButton (IconSize.Menu, "md-searchbox-clear");
entryAlignment = new Gtk.Alignment (0.5f, 0.5f, 1f, 1f);
alignment.SetPadding (0, 0, 3, 3);
entryAlignment.Add (entry);
box.PackStart (filter_button, false, false, 0);
box.PackStart (entryAlignment, true, true, 0);
box.PackStart (clear_button, false, false, 0);
alignment.Add (box);
Add (alignment);
alignment.ShowAll ();
entry.StyleSet += OnInnerEntryStyleSet;
entry.StateChanged += OnInnerEntryStateChanged;
entry.FocusInEvent += OnInnerEntryFocusEvent;
entry.FocusOutEvent += OnInnerEntryFocusEvent;
entry.Changed += OnInnerEntryChanged;
entry.Activated += delegate {
NotifyActivated ();
};
filter_button.CanFocus = false;
clear_button.CanFocus = false;
filter_button.ButtonReleaseEvent += OnButtonReleaseEvent;
clear_button.ButtonReleaseEvent += OnButtonReleaseEvent;
clear_button.Clicked += OnClearButtonClicked;
ShowHideButtons ();
}