You can just use Itemwith Layout.fillHeight: true:
import QtQuick 2.0
import QtQuick.Controls 1.4
import QtQuick.Layouts 1.3
ApplicationWindow {
visible: true
ColumnLayout {
anchors.fill: parent
Button {
Layout.fillWidth: true
text: "PushButton"
}
Button {
Layout.fillWidth: true
text: "PushButton"
}
Label {
Layout.fillWidth: true
text: "TextLabel"
}
Item {
Layout.fillWidth: true
Layout.fillHeight: true
Rectangle { anchors.fill: parent; color: "#ffaaaa" }
}
}
}

EDIT: Column spacer, Column , .