By default, the HasButtons property is exNoButtons. The control displays no +/- buttons if the HasButtons property is exNoButtons. Use the HasButton property to hide a +/- button for a particular node. The node displays the +/- button only if the node contains child nodes, and the HasButton property is True. Use the Expanded property to expand or collapse a node by code. The control fires the Expand event when user expands or collapse a node. Use the ButtonsAlign property to specify the position of +/- buttons inside nodes. Use the HasButtonsCustom property to assign an icon for +/- buttons, when the HasButtons property is exCustom. Use the Images, ReplaceIcon methods to load new icons to the control's icons collection. Use the BeginUpdate and EndUpdate properties to maintain performance while do multiple changes to the control.

The following VB sample assigns different +/- buttons when expanding or collapsing the parent nodes:

With ChartView1
    .BeginUpdate
    .Images "gBJJgBAICAAGAAEAAQhYAf8Pf4hh0QihCJo2AEZjQAjEZFEaIEaEEaAIAkcbk0olUrlktl0vmExmUzmk1m03nE5nU7nk9n0/oFBoVDolFo1HpFJpVLplNp1PqFRqVTqlVq1XrFZrVbrldr1fsFhsVjslls1ntFptVrtltt1vuFxuVzul1u13vF5vV7vl9v1/wGBwWDwmFw2HxGJxWLxmNx2PyGRyWTymVy2XzGZzWbzmdz2f0Gh0WjwEWH0r08ekEikgAkso184iGkicPjcU2+zjW4jTnZ++jbv4Tvjbu4fF48adAv5fI4XO4ka4fRjO+4G73UZ3na7IAgI="
    .HasButtons = exCustom
    .HasButtonsCustom(False) = 1
    .HasButtonsCustom(True) = 2
    .EndUpdate
End With

The following C++ sample assigns different +/- buttons when expanding or collapsing the parent nodes:

m_chartview.BeginUpdate();
m_chartview.Images(COleVariant("gBJJgBAICAAGAAEAAQhYAf8Pf4hh0QihCJo2AEZjQAjEZFEaIEaEEaAIAkcbk0olUrlktl0vmExmUzmk1m03nE5nU7nk9n0/oFBoVDolFo1HpFJpVLplNp1PqFRqVTqlVq1XrFZrVbrldr1fsFhsVjslls1ntFptVrtltt1vuFxuVzul1u13vF5vV7vl9v1/wGBwWDwmFw2HxGJxWLxmNx2PyGRyWTymVy2XzGZzWbzmdz2f0Gh0WjwEWH0r08ekEikgAkso184iGkicPjcU2+zjW4jTnZ++jbv4Tvjbu4fF48adAv5fI4XO4ka4fRjO+4G73UZ3na7IAgI="));
m_chartview.SetHasButtons( 4 /*exCustom*/ );
m_chartview.SetHasButtonsCustom( FALSE, 1 );
m_chartview.SetHasButtonsCustom( TRUE, 2 );
m_chartview.EndUpdate();

The following VB.NET sample assigns different +/- buttons when expanding or collapsing the parent nodes:

With AxChartView1
    .Images("gBJJgBAICAAGAAEAAQhYAf8Pf4hh0QihCJo2AEZjQAjEZFEaIEaEEaAIAkcbk0olUrlktl0vmExmUzmk1m03nE5nU7nk9n0/oFBoVDolFo1HpFJpVLplNp1PqFRqVTqlVq1XrFZrVbrldr1fsFhsVjslls1ntFptVrtltt1vuFxuVzul1u13vF5vV7vl9v1/wGBwWDwmFw2HxGJxWLxmNx2PyGRyWTymVy2XzGZzWbzmdz2f0Gh0WjwEWH0r08ekEikgAkso184iGkicPjcU2+zjW4jTnZ++jbv4Tvjbu4fF48adAv5fI4XO4ka4fRjO+4G73UZ3na7IAgI=")
    .HasButtons = EXORGCHARTLib.ExpandButtonEnum.exCustom
    .set_HasButtonsCustom(False, 1)
    .set_HasButtonsCustom(True, 2)
End With

The following C# sample assigns different +/- buttons when expanding or collapsing the parent nodes:

axChartView1.BeginUpdate();
axChartView1.Images("gBJJgBAICAAGAAEAAQhYAf8Pf4hh0QihCJo2AEZjQAjEZFEaIEaEEaAIAkcbk0olUrlktl0vmExmUzmk1m03nE5nU7nk9n0/oFBoVDolFo1HpFJpVLplNp1PqFRqVTqlVq1XrFZrVbrldr1fsFhsVjslls1ntFptVrtltt1vuFxuVzul1u13vF5vV7vl9v1/wGBwWDwmFw2HxGJxWLxmNx2PyGRyWTymVy2XzGZzWbzmdz2f0Gh0WjwEWH0r08ekEikgAkso184iGkicPjcU2+zjW4jTnZ++jbv4Tvjbu4fF48adAv5fI4XO4ka4fRjO+4G73UZ3na7IAgI=");
axChartView1.HasButtons = EXORGCHARTLib.ExpandButtonEnum.exCustom;
axChartView1.set_HasButtonsCustom(false, 1);
axChartView1.set_HasButtonsCustom(true, 2);
axChartView1.EndUpdate();

The following VFP sample assigns different +/- buttons when expanding or collapsing the parent nodes:

local s
s = "gBJJgBAICAAEg4ACEKAD/hz/EMNh8TIRNGwAjEZAEXjAojJAjMLjABAAgjUYkUnlUrlktl0vmExmUzmk1m03nE5nU7nk9n0/oFBoVDolFo1HpFJpVLplNp1PqFRqVTqlVq1XrFZrVbrldr1fsFhsVjslls1ntFptVrtltt1vuFxuVzul1u13vF5vV7vl9v0/io+leCjs"
s = s + "fkMZkkkjSAncPiUOjUTyOOjOSjLnZ+YjTvzjvjTuzuf0MZdAv0uizmoz0ZzurjGYzWVykYy202YAgIA="

with thisform.ChartView1
    .BeginUpdate()
    .Images(s)
    .HasButtons = 4 && exCustom
    local t
    t = "HasButtonsCustom(false) = 1" + chr(13) + chr(10)
    t = t + "HasButtonsCustom(true) = 2"
    .Template = t
    .EndUpdate
endwith