You have added a ChartToolset and have assigned it to the chart. This
deactivates the built-in toolset which is responsible for default
zooming and panning. All you have to do is to add another ZoomDragTool
to your toolset. To make it respond to dragging with the left mouse
button set its Shift property to ssLeft, this is the standard behavior
of the built-in zoom tool. If you need panning as well add a
ZoomPanTool; by default, it becomes active with the right mouse button.
But if you already use these Shift values in tools that are currently in
your toolset, select something else, or add a key like ssCtrl, or
ssShift (or both) - there are many possibilities.
There are several tutorial which cover zooming in TAChart:
* http://wiki.lazarus.freepascal.org/TAChart_Tutorial:_Chart_Tools,
* http://wiki.lazarus.freepascal.org/TAChart_Tutorial:_Function_Series
* http://wiki.lazarus.freepascal.org/TAChart_Tutorial:_ColorMapSeries,_Zooming
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