Toolbar Buttons

Opens a new data capture file. For GC analysis, this is the file emitted by the JVM -Xverbosegc:file=filename or -Xloggc:filename option.
Prints the contents of the current screen.
Toggles the X-axis time display between elapsed program time in seconds and clock time.
Although individual data points represent discrete events, it is sometimes useful to be clear about the sequence of events when the data are crowded.  Connecting data points with lines aids in this visualization.  This button toggles those lines on and off.
Toggles display of data points based on GC type.
Toggles the comparison display between 3-D and 2-D.
Resets data chart magnification to full view.  To magnify a segment of a chart, click and drag the mouse across the portion of a chart you wish to see in greater detail.  The chart will be redrawn showing just the highlighted data you selected.
Help on item.  When this button is clicked, the cursor changes to a question mark.  Click again on an area of the screen about which you would like specific help.