Here is the xml snippet that contains the predefined series colors for the Vista theme (unfortunately there is no public chart API that would provide you with access to them so you would need to copy the colors manually):
<
Chart
SkinName
=
"Vista"
>
<
Series
>
<
ChartSeries
>
<
Appearance
>
<
Border
Color
=
""
/>
<
TextAppearance
>
<
TextProperties
Color
=
"89, 89, 89"
/>
</
TextAppearance
>
<
FillStyle
MainColor
=
"186, 207, 141"
SecondColor
=
"146, 176, 83"
>
<
FillSettings
GradientMode
=
"Vertical"
>
<
ComplexGradient
>
<
GradientElement
Color
=
"213, 247, 255"
/>
<
GradientElement
Color
=
"193, 239, 252"
Position
=
"0.5"
/>
<
GradientElement
Color
=
"157, 217, 238"
Position
=
"1"
/>
</
ComplexGradient
>
</
FillSettings
>
</
FillStyle
>
</
Appearance
>
</
ChartSeries
>
<
ChartSeries
>
<
Appearance
>
<
Border
Color
=
""
/>
<
TextAppearance
>
<
TextProperties
Color
=
"89, 89, 89"
/>
</
TextAppearance
>
<
FillStyle
MainColor
=
"235, 140, 104"
SecondColor
=
"214, 110, 90"
>
<
FillSettings
GradientMode
=
"Vertical"
>
<
ComplexGradient
>
<
GradientElement
Color
=
"218, 254, 122"
/>
<
GradientElement
Color
=
"198, 244, 80"
Position
=
"0.5"
/>
<
GradientElement
Color
=
"153, 205, 46"
Position
=
"1"
/>
</
ComplexGradient
>
</
FillSettings
>
</
FillStyle
>
</
Appearance
>
</
ChartSeries
>
<
ChartSeries
>
<
Appearance
>
<
Border
Color
=
""
/>
<
TextAppearance
>
<
TextProperties
Color
=
"89, 89, 89"
/>
</
TextAppearance
>
<
FillStyle
MainColor
=
"129, 192, 225"
SecondColor
=
"79, 129, 189"
>
<
FillSettings
GradientMode
=
"Vertical"
>
<
ComplexGradient
>
<
GradientElement
Color
=
"136, 221, 246"
/>
<
GradientElement
Color
=
"97, 203, 234"
Position
=
"0.5"
/>
<
GradientElement
Color
=
"59, 161, 197"
Position
=
"1"
/>
</
ComplexGradient
>
</
FillSettings
>
</
FillStyle
>
</
Appearance
>
</
ChartSeries
>
<
ChartSeries
>
<
Appearance
>
<
Border
Color
=
""
/>
<
TextAppearance
>
<
TextProperties
Color
=
"89, 89, 89"
/>
</
TextAppearance
>
<
FillStyle
MainColor
=
"200, 182, 80"
SecondColor
=
"176, 162, 83"
>
<
FillSettings
GradientMode
=
"Vertical"
>
<
ComplexGradient
>
<
GradientElement
Color
=
"163, 222, 78"
/>
<
GradientElement
Color
=
"132, 207, 27"
Position
=
"0.5"
/>
<
GradientElement
Color
=
"102, 181, 3"
Position
=
"1"
/>
</
ComplexGradient
>
</
FillSettings
>
</
FillStyle
>
</
Appearance
>
</
ChartSeries
>
<
ChartSeries
>
<
Appearance
>
<
Border
Color
=
""
/>
<
TextAppearance
>
<
TextProperties
Color
=
"89, 89, 89"
/>
</
TextAppearance
>
<
FillStyle
MainColor
=
"171, 62, 29"
SecondColor
=
"115, 36, 12"
>
<
FillSettings
GradientMode
=
"Vertical"
>
<
ComplexGradient
>
<
GradientElement
Color
=
"79, 152, 198"
/>
<
GradientElement
Color
=
"34, 123, 182"
Position
=
"0.5"
/>
<
GradientElement
Color
=
"4, 85, 156"
Position
=
"1"
/>
</
ComplexGradient
>
</
FillSettings
>
</
FillStyle
>
</
Appearance
>
</
ChartSeries
>
<
ChartSeries
>
<
Appearance
>
<
Border
Color
=
""
/>
<
TextAppearance
>
<
TextProperties
Color
=
"89, 89, 89"
/>
</
TextAppearance
>
<
FillStyle
MainColor
=
"156, 121, 182"
SecondColor
=
"127, 91, 154"
>
<
FillSettings
GradientMode
=
"Vertical"
>
<
ComplexGradient
>
<
GradientElement
Color
=
"86, 153, 78"
/>
<
GradientElement
Color
=
"43, 126, 33"
Position
=
"0.5"
/>
<
GradientElement
Color
=
"18, 96, 3"
Position
=
"1"
/>
</
ComplexGradient
>
</
FillSettings
>
</
FillStyle
>
</
Appearance
>
</
ChartSeries
>
<
ChartSeries
>
<
Appearance
>
<
Border
Color
=
""
/>
<
TextAppearance
>
<
TextProperties
Color
=
"89, 89, 89"
/>
</
TextAppearance
>
<
FillStyle
MainColor
=
"186, 207, 141"
SecondColor
=
"146, 176, 83"
>
<
FillSettings
GradientMode
=
"Vertical"
>
<
ComplexGradient
>
<
GradientElement
Color
=
"213, 247, 255"
/>
<
GradientElement
Color
=
"193, 239, 252"
Position
=
"0.5"
/>
<
GradientElement
Color
=
"157, 217, 238"
Position
=
"1"
/>
</
ComplexGradient
>
</
FillSettings
>
</
FillStyle
>
</
Appearance
>
</
ChartSeries
>
</
Series
>
<
Appearance
Corners
=
"Round, Round, Round, Round, 7"
>
<
FillStyle
FillType
=
"ComplexGradient"
>
<
FillSettings
>
<
ComplexGradient
>
<
GradientElement
Color
=
"243, 253, 255"
/>
<
GradientElement
Color
=
"White"
Position
=
"0.5"
/>
<
GradientElement
Color
=
"243, 253, 255"
Position
=
"1"
/>
</
ComplexGradient
>
</
FillSettings
>
</
FillStyle
>
<
Border
Color
=
"212, 221, 222"
/>
</
Appearance
>
<
ChartTitle
>
<
TextBlock
>
<
Appearance
>
<
TextProperties
Color
=
"86, 88, 89"
Font
=
"Verdana, 22px"
/>
</
Appearance
>
</
TextBlock
>
<
Appearance
>
<
FillStyle
MainColor
=
""
/>
<
Dimensions
Margins
=
"3%, 1px, 1px, 6%"
/>
<
Border
Visible
=
"False"
/>
</
Appearance
>
</
ChartTitle
>
<
Legend
>
<
TextBlock
>
<
Appearance
>
<
TextProperties
Color
=
"86, 88, 89"
/>
<
Position
AlignedPosition
=
"Top"
/>
</
Appearance
>
</
TextBlock
>
<
Appearance
>
<
Dimensions
Margins
=
"1px, 1%, 10%, 1px"
/>
<
Border
Color
=
""
/>
<
ItemTextAppearance
>
<
TextProperties
Color
=
"86, 88, 89"
/>
</
ItemTextAppearance
>
<
FillStyle
MainColor
=
""
/>
<
ItemMarkerAppearance
Figure
=
"Rectangle"
/>
</
Appearance
>
</
Legend
>
<
PlotArea
>
<
Appearance
>
<
FillStyle
MainColor
=
"Transparent"
SecondColor
=
"Transparent"
/>
<
Dimensions
Margins
=
"19%, 90px, 12%, 9%"
/>
<
Border
Color
=
"WhiteSmoke"
/>
</
Appearance
>
<
YAxis
>
<
Appearance
Color
=
"134, 134, 134"
>
<
MinorTick
Color
=
"196, 196, 196"
/>
<
TextAppearance
>
<
TextProperties
Color
=
"89, 89, 89"
/>
</
TextAppearance
>
<
MajorGridLines
Color
=
"196, 196, 196"
/>
<
MajorTick
Color
=
"196, 196, 196"
/>
<
MinorGridLines
Color
=
"196, 196, 196"
Width
=
"0"
/>
</
Appearance
>
<
AxisLabel
>
<
TextBlock
>
<
Appearance
>
<
TextProperties
Color
=
"220, 158, 119"
/>
</
Appearance
>
</
TextBlock
>
</
AxisLabel
>
</
YAxis
>
<
XAxis
>
<
Appearance
Color
=
"134, 134, 134"
>
<
TextAppearance
>
<
TextProperties
Color
=
"89, 89, 89"
/>
</
TextAppearance
>
<
MajorGridLines
Color
=
"196, 196, 196"
Width
=
"0"
/>
<
MajorTick
Color
=
"134, 134, 134"
/>
</
Appearance
>
<
AxisLabel
>
<
TextBlock
>
<
Appearance
>
<
TextProperties
Color
=
"51, 51, 51"
/>
</
Appearance
>
</
TextBlock
>
<
Appearance
>
<
Dimensions
Paddings
=
"1px, 1px, 10%, 1px"
/>
</
Appearance
>
</
AxisLabel
>
</
XAxis
>
</
PlotArea
>
</
Chart
>