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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.<br>
<br>
There are several tutorial which cover zooming in TAChart: <br>
<ul>
<li><a class="moz-txt-link-freetext" href="http://wiki.lazarus.freepascal.org/TAChart_Tutorial:_Chart_Tools">http://wiki.lazarus.freepascal.org/TAChart_Tutorial:_Chart_Tools</a>,
</li>
<li><a class="moz-txt-link-freetext" href="http://wiki.lazarus.freepascal.org/TAChart_Tutorial:_Function_Series">http://wiki.lazarus.freepascal.org/TAChart_Tutorial:_Function_Series</a></li>
<li><a class="moz-txt-link-freetext" href="http://wiki.lazarus.freepascal.org/TAChart_Tutorial:_ColorMapSeries,_Zooming">http://wiki.lazarus.freepascal.org/TAChart_Tutorial:_ColorMapSeries,_Zooming</a></li>
</ul>
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