Magnus,
This happens because our "GanttChart" portion is given by default a width of 2000 which usually is good enough for most scenarios, but in scenarios like this where the gantt container takes a much larger width, issue that you see happens. So, the quick fix is to give the gantt chart a larger width like 3000. You can do so while initializing the gantt like this:
$gantt_container.GanttControl({
....
GanttChartTemplateApplied: function (sender) {
var $GanttChart = $gantt_container.data("GanttControl").GetGanttChart();
$GanttChart.GanttChart({ AnchorTime: anchorTime, ViewWidth: 3000 });
}
});
Regards,
-Raja.