CreateHorizontalStrut
fLayout->AddItem(BSpaceLayoutItem::CreateHorizontalStrut(size));
static BSpaceLayoutItem* CreateHorizontalStrut(float width);
.Add(BSpaceLayoutItem::CreateHorizontalStrut(10), 2, rowNumber)
AddChild(BSpaceLayoutItem::CreateHorizontalStrut(15));
.Add(BSpaceLayoutItem::CreateHorizontalStrut(spacing))
.Add(BSpaceLayoutItem::CreateHorizontalStrut(32.0f))
layout->AddItem(BSpaceLayoutItem::CreateHorizontalStrut(3), 0, 1, 1, 3);
layout->AddItem(BSpaceLayoutItem::CreateHorizontalStrut(3), 3, 1, 1, 3);
fControlLayout->AddItem(BSpaceLayoutItem::CreateHorizontalStrut(5));
.Add(BSpaceLayoutItem::CreateHorizontalStrut(kSpacing*1.9))
.Add(BSpaceLayoutItem::CreateHorizontalStrut(10))
.Add(BSpaceLayoutItem::CreateHorizontalStrut(kLabelSpacing),
fButtonLayout->AddItem(1, BSpaceLayoutItem::CreateHorizontalStrut(
layout->AddItem(BSpaceLayoutItem::CreateHorizontalStrut(size));
paramLayout->AddItem(BSpaceLayoutItem::CreateHorizontalStrut(10));